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It isn't easy to start an electrical power grid back up after it has been shut down completely. Problems can include a lack of spare transformers, "cold start" loads, and the need for electricity to start up a power plant.
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Problems Restoring Electrical Power After a Blackout

The main problem is that it takes energy to produce energy. Most kinds of power plants generate electricity from water that has been heated to become steam. The power plants need some electricity to open valves and run pumps before it can boil water to make steam. So the power plant needs some electricity to make more electricity.

When you turn on a light bulb, it takes a lot more energy to light it to begin with than it does to keep it going. The same is true for most electrical devices. It can take up to 10 times more power to start something than it does to keep it running. When a power system tries to start back up after a blackout, lots and lots of devices that use electricity try to come on at the same time. They need lots of extra power to start up. That means the electric system needs to make more power than normal. That makes it hard for the system to start back up, too.

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